Auxiliary Optics System (AOS) Cost and Schedule Breakout Presentation NSF Review of Advanced LIGO Project Mike Smith, Phil Willems CIT

AOS Description & Deliverables change $9.04M AOS is responsible for procuring, assembling, and testing: Stray Light Control Beam Dumps and Baffles for ghost beams Arm Cavity Baffle for small angle scattered light, ITM, ETM Errant Beam Baffles to protect SUS fibers Attenuators for PO beams Output Faraday Isolator Thermal Compensation Ring Heaters for recycling & arm cavity mirrors CO2 Laser, shaped heating beam for ITM Wavefront probe/sensor optical system for all COC mirrors PO Mirror & Telescope Suspended PO Mirror to extract BS & ITM PO beam for IFO alignment control Non-suspended beam-reducing telescope and steering mirrors Suspension for existing ETM Telescope change $0.66M $1.96M change $2.76M

AOS Description & Deliverables-cont No Significant Change Initial Alignment System Replace or upgrade existing surveying equipment Visible & IR laser autocollimator, theodolite, optical square, etc. Optical Lever New Optical Lever Transmitter & Receiver (insensitive to mirror displacement) for all suspended optics, additional piers Photon Calibrator Provide known impulse to ETM mirror for calibration, using external radiation pressure Output Mode Matching Telescope Procure Mirrors for suspended beam reducing telescope--dark port GW signal Viewports Procure Viewports for: IFO sensing beams, Video camera, chamber illum, optlev, TCS (Zn Se) AOS is complete when all the elements are ready for installation $0.14M $1.01M $1.07M $0.83M $0.39M

AOS Work Breakdown Structure Unchanged WBS for “Subsystem” is organized by sub-component; or by major subsystem and then by category of equipment; or by subcomponent and then by phase – procure, assemble sub-assemblies, integrate, and test.

AOS Schedule Highlights Unchanged AOS is not on critical path Schedule is driven by need to optimize resource use

AOS Detailed Schedule 1-2 month schedule slip Detailed schedule is available on Project website http://www.ligo.caltech.edu/~advligo/aos/aos_current_progsched.pdf

AOS Milestones/Interfaces Unchanged

AOS Cost Estimating Unchanged Used the same standardized cost estimating approach used for initial LIGO Contingency analysis enhanced by Monte Carlo simulation based on risk assessment. Contingency estimate: see below* Initial LIGO history used for labor/material cost basis of most items New quotations for parabolic telescope/PO mirrors Materials scaled by increased beam size as appropriate Commissioned CO2 laser TCS cost Prototype cost basis for optical lever receiver and Hartmann sensors Engineering cost estimate for TCS ring heaters PO mirror suspension engineering estimate based on quad SUS prototype * For LIGO estimating, contingency was first estimated using a standard qualitative process to assign risk factors at the activity level for technical and procurement risk and at the WBS level for schedule risk. The additional risk factor resulting from the Monte Carlo analysis was added at the subsystem level. When you look at the cost book detail, the individual cost items have the same contingency value, even though we listed whether the estimate is a vendor quote or an engineering estimate. This is because the risk factors were evaluated at the activity level, not at the individual cost item.

AOS Cost to WBS Level 5 Costs have been revised, see Level 6

AOS Cost to WBS Level 6--Revisions

AOS Cost Book Details Costs revised 4/11/07, see slide 10 Detailed cost book information is available on Project website http://www.ligo.caltech.edu/~advligo/aos/aos_current_cost_est.pdf

AOS Estimate Changes Revised Revision AOS cost change as of 4/11/07 to the following: 4.07.4.1.1      638,746 (using a LOS to suspend the Faraday isolator instead of a SOS) 4.07.4.5.1      1,516,752 (an increase of 612,736 occurred because the ITMX PO mirror will be suspended like the BS PO mirror, which requires a double pendulum ) 4.07.4.5.2      18,081 (this is a first article PO Telescope housing that won't be reused, and was left off the cost sheet) 4.07.4.9        293,224 (slight cost reduction due to updated costs for mirrors) 4.07.4.A        333,011 (correction to match the figure on my 1/22/07 spreadsheet) The updated total equipment cost will be 5,537,119 (an increase of 523,914 over what is shown in slide 10)

Changes in Scope Since June 2006 Suspend Output Faraday Isolator with modified LOS SUS Suspend Cryopump Baffle Suspend Cavity Beam Dumps from BSC Optics Table Suspend Arm Cavity Baffles from BSC Optics Table Suspend ITM Elliptical Baffles from BSC Optics Table TCS Ring Heaters removed from compensation plates, installed on Test Masses Errant Baffles, MC baffles assigned to IO AOS is responsible for cameras—not costed yet

AOS Response to Review Panel Recommendations Recommendation: “The Panel encourages continuing the effort to improve TCS including a sensing method since it seems to be an effective way to control overall mode quality in the system. It provides a way to mitigate the parametric instability, the impact of which on the overall system is still not known.” We have selected the Adelaide Hartmann sensor for Advanced LIGO TCS and incorporated it into the baseline design. Thermal control of parametric instability is currently under theoretical and experimental research at Gingin. Recommendation: “The Panel encourages the design of the compensation plates.” We have a baseline CP design, and have ordered a prototype to install at LASTI as part of an overall TCS test. Recommendation: “The Panel encourages continuing the effort to qualify a second vendor for the parabolic mirrors.” We have qualified a second vendor, Tydex, J. S. Co. of Saint Petersburg, Russia. Given their high quality and low price they are now our primary vendor.

AOS Staffing Profile Revised

AOS Risks and Concerns Changed Cost/Schedule increase/delay--absorption in the core optics may be anomalous may need higher power TCS heating may need to develop a scanning heater design as a backup Cost/Schedule increase/delay- -acoustic parametric instability make TCS more flexible to handle both API and thermal lensing

AOS Test Plans Initial Alignment System Thermal Compensation System Similar to initial LIGO, no additional testing needed Thermal Compensation System Full sensor-compensator test planned for LASTI in 2008-9 Stray Light Control BRDF measurements of critical materials Pickoff Mirrors, ETM Telescope, and Faraday Isolator SUS Prototype tests during preliminary design phase Photon Calibrator Standalone test during preliminary design phase Optical Levers Mostly pre-tested in initial LIGO, new zoom lens design prototyped in 2004 Viewports Very basic elements, no test needed Output Mode-Matching Telescope Identical to Input Mode-Matching Telescope—will use IO test results